Compare the2025 Lexus ISVS 2025 Alfa Romeo Giulia

For enhanced safety, the front and rear seat shoulder belts of the Lexus IS have pretensioners to tighten the seatbelts and eliminate dangerous slack in the event of a collision and force limiters to limit the pressure the belts will exert on the passengers. The Alfa Romeo Giulia doesn’t offer pretensioners for its rear seat belts.

The IS’ optional pre-crash front seatbelts will tighten automatically in the event the vehicle detects an impending crash, improving protection against injury significantly. The Giulia doesn’t offer pre-crash pretensioners.

For enhanced safety, the front seat shoulder belts of the Lexus IS are height-adjustable to accommodate a wide variety of driver and passenger heights. A better fit can prevent injuries and the increased comfort also encourages passengers to buckle up. The Alfa Romeo Giulia doesn’t offer height-adjustable seat belts.

In the past twenty years hundreds of infants and young children have died after being left in vehicles, usually by accident. When turning the vehicle off, drivers of the IS are reminded to check the back seat if they opened the rear door before starting out. The Giulia doesn’t offer a back seat reminder.

The IS has a standard Secondary Collision Brake, which automatically applies the brakes in the event of a crash to help prevent secondary collisions and prevent further injuries. The Giulia doesn’t offer a post collision braking system: in the event of a collision that triggers the airbags, more collisions are possible without the protection of airbags that may have already deployed.

Over 200 people are killed each year when backed over by motor vehicles. The IS offers optional Intuitive Parking Assist with Auto Braking that uses rear sensors to monitor for objects to the rear and automatically applies the brakes to prevent a collision. The Giulia doesn’t offer backup collision prevention brakes.

The IS offers an optional Panoramic View Monitor to allow the driver to see objects all around the vehicle on a screen. The Giulia only offers a rear monitor and front and rear parking sensors that beep or flash a light. That doesn’t help with obstacles to the sides.

Both the IS and Giulia have rear cross-traffic warning, but the IS offers optional Rear Cross-Traffic Braking (automatically applies the brakes) to better prevent a collision when backing near traffic. The Giulia’s Rear Cross-Path Detection doesn’t automatically brake.

Both the IS and the Giulia have standard driver and passenger frontal airbags, front side-impact airbags, driver and front passenger knee airbags, side-impact head airbags, four-wheel antilock brakes, traction control, electronic stability systems to prevent skidding, crash mitigating brakes, daytime running lights, lane departure warning systems, blind spot warning systems, rearview cameras, rear cross-path warning and available all wheel drive.

Lexus’ powertrain warranty covers the IS 2 years and 20,000 miles longer than Alfa Romeo covers the Giulia. Any repair needed on the engine, transmission, axles, joints or driveshafts is fully covered for 6 years or 70,000 miles. Coverage on the Giulia ends after only 4 years or 50,000 miles.

The IS’ corrosion warranty is 1 year longer than the Giulia’s (6 vs. 5 years).

There are almost 2 times as many Lexus dealers as there are Alfa Romeo dealers, which makes it much easier should you ever need service under the IS’ warranty.

A reliable vehicle saves its owner time, money and trouble. Nobody wants to be stranded or have to be without a vehicle while it’s being repaired. Consumer Reports rates the IS’ reliability 40 points higher than the Giulia.

J.D. Power and Associates rated the IS first among compact premium cars in their 2024 Initial Quality Study. The Giulia isn’t in the top three.

J.D. Power and Associates’ 2024 Initial Quality Study of new car owners surveyed provide the statistics that show that Lexus vehicles are better in initial quality than Alfa Romeo vehicles. J.D. Power ranks Lexus above average in initial quality. With 52 more problems per 100 vehicles, Alfa Romeo is rated below average.

The IS 350’s standard 3.5 DOHC V6 produces 31 more horsepower (311 vs. 280) than the Giulia’s 2.0 turbo 4-cylinder. The IS 500’s standard 5.0 DOHC V8 produces 192 more horsepower (472 vs. 280) and 89 lbs.-ft. more torque (395 vs. 306) than the Giulia’s 2.0 turbo 4-cylinder.

As tested in Consumer Reports the IS 300 AWD 3.5 DOHC V6 is faster than the Alfa Romeo Giulia:

As tested in Motor Trend the IS 500 5.0 DOHC V8 is faster than the Alfa Romeo Giulia 2.0:

The IS has 2.1 gallons more fuel capacity than the Giulia (17.4 vs. 15.3 gallons), for longer range between fill-ups.

For better stopping power the IS 500 Performance’s front brake rotors are larger than those on the Giulia:

The IS’ standard front and rear disc brakes are vented to help dissipate heat for shorter stops with less fading. The rear discs on the Giulia are solid, not vented.

The IS stops much shorter than the Giulia:

For better traction, the IS has larger standard tires than the Giulia (235/45R18 vs. 225/45R18). The IS F Sport’s tires are larger than the largest tires available on the Giulia (F:235/40R19 & R:265/35R19 vs. F:225/40R19 & R:255/35R19).

The IS has a standard space-saver spare tire so you can replace a flat tire and drive to have the flat repaired or replaced. A spare tire isn’t available on the Giulia; it requires you to depend on its run-flat tires, which limits mileage and speed before they are repaired. If a run-flat is damaged beyond repair by a road hazard your vehicle will have to be towed.

The IS 350 F Sport handles at .93 G’s, while the Giulia Q4 pulls only .80 G’s of cornering force in a Motor Trend skidpad test.

The IS 500 Performance executes Motor Trend’s “Figure Eight” maneuver 1.9 seconds quicker than the Giulia (25.2 seconds @ .74 average G’s vs. 27.1 seconds @ .66 average G’s).

For better maneuverability, the IS’ turning circle is 1.2 feet tighter than the Giulia’s (34.2 feet vs. 35.4 feet).

The IS has 2.4 inches more front legroom and .3 inches more rear hip room than the Giulia.

With its sedan body style, valet key, locking rear seatbacks and remote trunk release lockout, the IS offers cargo security. The Giulia’s non-lockable remote release defeats cargo security.

J.D. Power and Associates surveys of service recipients show that Lexus service is better than Alfa Romeo. J.D. Power ranks Lexus first in service department satisfaction. With a 30% lower rating, Alfa Romeo is ranked 11th.

Unlike the driver-only memory seat and mirrors in the Giulia, the IS offers an optional driver and passenger memory, so that when drivers switch, the memory setting adjusts the driver’s seat, steering wheel position and outside mirror angle and the front passenger seat also adjusts to the new passenger’s preset preferences.

The IS’ instruments include an oil pressure gauge and a temperature gauge - which could save your engine! Often ‘idiot lights’ don’t warn you until damage has been done. The Giulia does not have an oil pressure gauge.

If the windows are left open on the IS the driver can close them all at the outside door handle. On a hot day the driver can lower the windows at the outside door handle or from a distance using the keyless remote. (This window function must be activated by your Lexus service department.) The driver of the Giulia can only operate the windows from inside the vehicle, with the ignition on.

Consumer Reports rated the IS’ headlight performance “Very Good,” a higher rating than the Giulia’s headlights, which were rated “Good.”

A power rear sunshade is optional in the IS to help block heat and glare for the rear passengers. The Giulia doesn’t offer a rear sunshade.

When the IS with available tilt-down mirrors is put in reverse, both rearview mirrors tilt from their original position. This gives the driver a better view of the curb during parallel parking maneuvers. Shifting out of reverse puts the mirrors into their original positions. The Giulia’s mirrors don’t automatically adjust for backing.

Optional air-conditioned seats in the IS keep the driver and front passenger comfortable and take the sting out of hot seats in Summer. The Giulia doesn’t offer air-conditioned seats.

The IS will cost the buyer less in the long run because of its superior resale value. The IntelliChoice estimates that the IS will retain 53.95% to 59.37% of its original price after five years, while the Giulia only retains 48.07% to 50.12%.

Consumer Reports® recommends the Lexus IS, based on reliability, safety and performance. The Alfa Romeo Giulia isn't recommended.

The Lexus IS outsold the Alfa Romeo Giulia by almost seven to one during 2023.